<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <button id="btn">click</button>
  <script>
    var btn = document.getElementById('btn')
    btn.addEventListener('click', throttle(sayHi))

    function throttle(fn) {
      let canRun = true
      return function () {
        if (!canRun) return
        canRun = false
        setTimeout(() => {
          fn.apply(this, arguments)
          canRun = true
        }, 1000)
      }
    }

    function sayHi() {
      console.log('点击事件');
    }
  </script>
</body>

</html>